How to show PDF in browser

hoge.rb

class TasksController < ApplicationController
  def index
    @tasks = Tasks.all
    respond_to do |format|
      format.html
      # GET /tasks.pdf
      # response as pdf
      format.pdf do
        report = ThinReports::Report.new :layout => 'tasks.tlf'
        
        @tasks.each do |task|
          report.list.add_row :name => task.name, 
                              :due_date => task.due_date, 
                              :done => task.done
        end

        send_data report.generate, :type => 'application/pdf', 
                                   :filename => 'tasks.pdf', 
                                   :disposition => 'inline' # set 'inline' (default 'attachment')
      end
    end
  end
 
 # :
 end